Le 19/09/2018 à 04:56, Aneesh Kumar K.V a écrit :
On 9/18/18 10:27 PM, Christophe Leroy wrote:
There is no point in taking the page table lock as
pte_frag is always NULL when we have only one fragment.
Signed-off-by: Christophe Leroy <christophe.le...@c-s.fr>
---
arch/powerpc/mm/pgtable-frag.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/powerpc/mm/pgtable-frag.c
b/arch/powerpc/mm/pgtable-frag.c
index bc924822dcd6..ab4910e92aaf 100644
--- a/arch/powerpc/mm/pgtable-frag.c
+++ b/arch/powerpc/mm/pgtable-frag.c
@@ -85,6 +85,9 @@ static pte_t *get_pte_from_cache(struct mm_struct *mm)
{
void *pte_frag, *ret;
+ if (PTE_FRAG_NR == 1)
+ return NULL;
+
spin_lock(&mm->page_table_lock);
ret = mm->context.pte_frag;
if (ret) {
May be update get_pmd_from_cache too?
Ok, done in v5
Christophe
